2014 Chevrolet Silverado and GMC Sierra…
Contents
1. Both pickups are made from roll formed steel for increased strength and reduced mass compared with the stamped beds used by major competitors Due to the added torque of the new V8 engines new 9 5 or 9 76 inch rear New bumper corner steps combined with handholds built into the axles are used new box rail protectors make it easier to access the box Apr Jun 2013 Servicelnsights 5 SPECIAL INSERT Three all new EcoTec3 engines Three new Ecolec3 engines developed specifically for the demands of truck duty cycles are now available All feature a trio of state of the art technologies direct injection cylinder deactivation and continuously variable valve timing that optimize power torque and efficiency across a broad range of operating conditions The new trio of engines is designed to match the needs of truck customers and to provide more horsepower more torque and better fuel economy than previous Silverado and Sierra engines All three engines feature an advanced combustion system for more efficiently turning fuel into work and all three are designed to seamlessly switch to four cylinder mode to improve efficiency during light load driving 2014 4 3L V6 EcoTec3 2014 GMC Sierra 6 Apr Jun 2013 Servicelnsights Can We Talk Vehicle Set ACDelco d MNS tides 3 3 Data Communication Networks There are many components in a vehicle that rely on information fr2. a a bap vicelnsigh 7 T SERVICE CENTERS m _ EJ Z A ff Genuine z Pats ACDelco gt More 5 3L reman engine replacements 2014 Chevrolet Silverado cnmewsy a gt Piston Ring Kits for select GM 5 3L Nn d G IVI C S e rra uee engine repairs now available gt Genuine GM Rewards added to Next generation picku ps RepairLink with MORE gt GM Powertrain Warranty feature advanced powertrain simply aE e design and technology gt GM reman engines offer more gt TechConnect service procedures i Vig ant t f i F we ad h n 3 f r j A y a i H 4 whe au 1 s a i 3 CONTENTS GM OE Service 3 Business of Repairs R Parts Update New ideas that can benefit The latest word on product how your shop operates and profits development and technologies The Technical Side Discover new ways to approach service and repairs Genuine AM Parts GM Servicelnsights Online More Genuine GM Parts resources and links E Download this issue and past issues of GM Servicelnsights magazine at www gmserviceinsights com GM Servicelnsights Headquarters 2604 N E Industrial Dr 230 N Kansas City MO 64117 Email dealersupport proactgroup com Compliments of your GM dealer We invite your input and suggestions Please address letters to the editor to the above address Letters submitted imply the right to edit and publish Every effort is
3. loyal GM Parts customers is a big part of that Amy Buzan Wholesale Dealer Channel manager with GM Customer Care and Aftersales GM CCA The Genuine GM Rewards program is available to all ISCs by simply following these steps 1 Secure a certificate number from your GM dealer 2 Establish an ID and password at www genuinegmrewards com 3 Build a profile and a points wallet 4 Watch the rewards pile up as you buy qualifying parts Points earned can be accumulated and used to purchase a wide variety of consumer products and services Complete program information is available from a link at www genuinegmparts com Genuine Parts Revised GM Warranty Card Carries Latest Terms More Clarity A great thing has just gotten better Expanded and simplified the warranty on GM powertrain assemblies components and Chevrolet Performance Parts makes it more compelling than ever to look to your GM dealer for OE parts The warranty has also been enhanced for easier reference and clarity To help Independent Service Centers ISCs and customers better understand the terms it has clearer language and carries fewer footnotes It can be accessed from www genuinegmparts com The parts and labor warranty for GM engines transmissions and transfer cases in most applications now applies when these are sold over the counter and installed by a GM dealer or qualified ISC Car and light truck engines have a 36 months or 100 000 m
4. Diagnostic Link ALDL However any unauthorized device connected to the DLC may cause a vari ety of hard to diagnose conditions Many of the problems caused by devices connected to the DLC are communication issues on the High speed Controller Area Network HSCAN bus An additional issue with diagnosing these conditions is that many times the device itself may be removed by customers when their vehicle is brought in for service Many possible problems are caused by an open connection on the HSCAN bus For example if the device only makes connection with one CAN it will cause bus errors and strange control module behavior Known Symptoms The various issues described by cus tomers with their vehicles are often related to high or low speed data bus traffic The conditions can be extremely varied but some known Issues are e Radio will not turn off after turning off the vehicle e Bus or LAN traffic stays active leading to a discharged battery e Problems reprogramming control modules either because of interfer ence or the device will not allow the bus to power down e Interference with OnStar s ability to provide diagnostic data e Engine and transmission perfor mance issues with the Check Engine light on e Intermittent stalling e Reduced power DIC messages and DICs e StabiliTrak DIC messages and DTCs e DTC C0561 System Disabled Information Stored Invalid Data in the Electronic Brake Control Modul
5. J Lackey Cleaning Engine Gasket Sealing Surfaces When cleaning engine gasket sealing surfaces or cleaning parts from an engine that are to be reused do not use sur face conditioning discs These discs can cause damage to the sealing surface or generate debris that will cause damage to bearing surfaces in cast iron and aluminum engine blocks In fact these discs should not be used on any sealing surfaces including transmissions transfer cases and axles The feel of the sealing surface is critical not the appear ance After proper cleaning of an engine there will be indentations from the gasket left in the cylinder head with all the gasket material removed The new gasket will fill these small indentations when it is installed Abrasives Cause Engine Damage Do not use surface conditioning disks Abrasive pad or bristle devices typically made of woven fiber or molded bristles should not be used because e Abrasive pads will produce fine grit that the oil filter will not be able to remove from the oil This grit is abrasive and has been known to cause internal engine damage Abrasive pads can easily remove enough material to round cylinder head surfaces which can affect the gasket s ability to seal especially in the narrow seal areas between the combustion chambers and coolant jackets e Abrasive pads wire and rubber finger wheels can remove enough metal to affect cylinder head block oil pan rail and intake m
6. circuit to the outside tempera ture display The outside air tempera ture algorithm uses three pieces of information outside air temperature data vehicle speed and the time the engine was turned off When the engine is first started the algorithm looks at how long the engine was off and if the outside temperature is lower than the last reading taken during the previous ignition cycle From this information it s determined if a new outside temperature reading should betaken If the engine was off long enough or the current outside air temperature Is cooler than the stored value a new outside temperature reading Is taken and Outside Air Temperature Display Operation displayed If the engine was not off long enough or the current outside air temperature is higher than the stored value from the previous ignition cycle the last stored value of outside air temperature taken will be displayed The outside air temperature will continue to be updated every second as long as the outside air temperature is the same or cooler than the previous reading Once the new outside air temperature reading exceeds the previous temperature and the vehicle is traveling less than 18 mph 29 km h the displayed outside air temperature will remain at its last value Once the vehicle speed exceeds 18 mph the displayed outside air temperature will be updated If the speed drops below 18 mph the outside air temperature will freeze at its last v
7. device for further resolution If the condition is not eliminated continue with the normal diagnostics Possible Devices Connected devices may be used for such things as tracking and or main tenance interval scheduling more common on fleet and rental vehicles insurance monitoring that automatically keeps track of the vehicle s driving record aftermarket cruise control police speed checking RADAR or LIDAR and other aftermarket components 3 TECHCONNECT Sometimes an aftermarket device has another DLC on it and the rest of the harness is tucked out of sight underneath the instrument panel mak ing it not completely obvious to the technician while still allowing diagnostic tools to be used Aftermarket cruise control interface at the DLC Se Fleet tracking interface at the DLC OnStar Certain aftermarket devices con nected to the DLC may interfere with OnStar s ability to perform a diagnostic probe when requested via a blue but ton call by a subscriber These devices also prohibit the ability to gather diag nostic and tire pressure data for a subscriber s scheduled OnStar Vehicle Diagnostic OVD e mail These aftermarket devices use the vehicle s serial data bus to perform data requests and or information gathering When these devices are requesting data OnStar is designed not to inter fere with any data request being made by these devices as required by OBD II regulations Thanks to B
8. rail sectioning When sectioning the rear frame rail on a 2008 2012 Malibu there may not be any die marks on the vehicle frame rail or the new part as indicated in the GM Service Information The die marks are not present because the exhaust hanger is attached to the frame where they would have been Locate the section that is about 60 mm wide between the exhaust hanger and the rear slot in the rail Then follow the sectioning directions in the appropri ate Service Information procedure It is best to cut rearward of the brack et because of the flange change on the top of the rail Product Information For tree technical assistance and product information regarding specific ACDelco products contact these toll free information hotlines staffed by ASE certified technicians Brakes 1 888 701 6169 prompt 1 Chassis 1 888 701 6169 prompt 2 Clutches 1 888 725 8625 Lift Supports 1 800 790 5438 shocks 1 877 466 7752 Starters and Alternators 1 800 228 9672 Steering Pumps Rack and Pinion Gears 1 866 833 5567 Wiper Blades 1 800 810 7096 Training Update Training on the Go ACDelco technical training vid eos can now be accessed from a mobile device using ACDelco Training s mobile site for iPhone iPad and Android devices The mobile site offers technical Videos on Demand VOD along with these other mobile capabilities e Read status and news articles e
9. reused Do not use a metal razor blade which can easily gouge the sealing surface especially on aluminum components When using a razor blade type gasket scraper use a new razor blade for each cylinder head and corresponding block surface Hold the blade as parallel as possible to the gasket surface to ensure that the razor blade does not gouge or scratch the gasket surfaces Do not gouge or scrape the com bustion chamber surfaces or any engine sealing surface during the cleaning process To properly clean the sealing surface prior to reassembly GM Low VOC Cleaner part number 19287401 in Canada part number 88901247 should be sprayed on the mating surface Avoid getting solvent in any area other than the mating surface to be cleaned Allow it to soak in for several minutes to loosen the old RTV sealer gasket material before using a razor blade or non metallic scraper to remove all loose sealer gasket material For additional information refer to GM Bulletin 00 06 01 012D Thanks to Randy McCrite 4 TECHCONNECT New Interior Comfort Controls Seminar If you ever wondered why the temperature actuator does not move when the temperature setting is changed of if the sensor in the headliner has anything to do with temperature control performance check out the latest ACDelco Interior Comfort Controls seminar S ACO7 04 01SEM along with other engine controls to ensure the engine runs efficiently under various driving condit
10. using the radio as the Gateway module The Mid Speed GMLAN Bus is similar to the High Speed GMLAN Bus except that it uses a slower transmission rate of 125 Kbit s This bus is intended for use where the system response time demands that a large amount of data be transmitted in a relatively short amount of time such as updating a graphics display It is usually used for infotainment applications A Low Speed GMLAN Bus is used in applications where a high data rate is not required It is typically used for operator controlled functions where the response time requirements are slower than those required for dynam ic vehicle control The Low Speed GMLAN Serial Data Network consists of a single wire ground referenced bus with high side voltage drive During on road vehicle operation data symbols 1 s and 0 s are transmitted sequentially at the nor mal rate of 33 3 Kbit s The data symbols to be transmit ted over the bus are represented by different voltage signals on the bus When the Low Speed GMLAN Bus is at rest and is not being driven there is a low signal voltage of approximately 0 2V This represents a logic 1 When a logic 0 is to be transmitted the signal voltage is driven higher to around 4 0V or higher The Local Interconnect Network LIN Bus consists of a single wire with a transmission rate of 10 417 Kbit s This bus is used to exchange informa tion between a master control module and other s
11. volts or less TXL wire has the thinnest insulation of the three types of cross linked poly ethylene wire followed by GXL wire and SXL wire which has the thickest insulation When making wire repairs refer to GM Service Information for instructions on splicing copper wire using splice sleeves folded over wire repair and correct wire gauge sizes for the proper application Transmission Connector Conditions 2013 ATS built prior to 12 12 12 2008 2013 CTS 2007 n 2009 SRX and 2006 2011 STS models equipped with a 6 speed automatic transmission One or more of the Check for unseated pin s in the transmission following con connector ditions may be present on these vehicles e Check Engine Service Engine Soon MIL illuminated e One or more DTCs set e Reduced power e No crank no start e Multiple MILs illuminated e Transmission shifts hard e Door locks cycle while driving The Transmission Control Module TCM or Engine Control Module ECM may not communicate with the scan tool The cause may be an unseated pin s in the transmission connector Inspect the transmission connector X1 terminal connections Disconnect the connector and carefully tug on each wire to ensure the pins are fully seated A side load on the wires may cause a false positive lock Repair the connec tions as necessary 7 TECHCONNECT Rear Frame Rail Sectioning Instructions 2008 2012 Malibu Frame
12. Link with MORE as your ordering platform as you order you ll be able to clearly see which GM powertrain components and assemblies are part of the new Genuine GM Rewards program And you ll be certain of getting your reward points Select GM Powertrain assemblies engines and transmissions are worth 50 reward points 50 while components net a rebate of four percent of dealer list price These parts are flagged as qualifying purchases on the OE parts online ordering platform Qualifying orders relayed to that dealer will be automatically calculated and credited monthly provided the Independent Service Center ISC has signed up with a participating GM dealer for the program MECHANICAL GR oeconnection com E Apr Jun 2013 Servicelnsights REWARDS Qualifying parts are flagged with the word PROMO in the Avail column on the site When the order is placed a Program icon will appear indicating information is available on the nature of the promotional program Clicking on the icon yields details in this case about Genuine GM Rewards We want to encourage ISCs to use RepairLink with MORE all the way through the parts ordering process and we want to make sure they understand all the benefits it has to offer One of those benefits is to not just fully replicate the experience of how they ve always placed orders but also to improve upon it The ability to place orders quickly and to continue being rewarded for being
13. View your training path and records e Access your schedule and profile e Access FAQs about the site e Contact the Help Desk To access the ACDelco Training mobile site log on to http mobile acdelcotraining com from a compatible iPhone iPad or Android device The mobile site will launch along with the option to switch back to the full site On the site users can browse VOD sessions by Category or Popularity or search to find specific content The videos will operate the same as they do on a PC How to Take ACDelco Training Go to www acdelcotechconnect com and click the Training tab to log in to the ACDelco Learning Management System LMS e To enroll in courses in your train ing path open the home page to view your Training Progress Status Report select Click Here to Show Detail and then click the course number and title to view details on a specific course and to launch or enroll in the course e To enroll in an Instructor Led Training ILT course ILTs are full day hands on classroom courses click Take Training gt Instructor Led Training to view the catalog and select a specific course Current Instructor Led Training Courses The following ILT courses are currently being scheduled Course Number Course Name S AC07 02 01ILT Automotive Air Conditioning Advanced Course Number S EP08 02 01ILT Refrigerant System Diagnostics S ACO07 03 01ILT HVAC Control System Operation and Diag
14. able engine in any light duty pickup All three engines feature a six speed automatic transmission with gear ratios and shift schedules optimized for performance and efficiency The transmissions feature Auto Grade Braking which downshifts on downgrades to help reduce brake wear ee ia D a E a Even though the 2014 Silverado and Sierra are new vehicles extensive service and repair information resources will soon be a click away at www gmtechinfo com Electronic Service Information Technicians and shop owners can log on to the site to gain access to subscription services for service procedures and repair manuals A complete Service Manual is accessible 24 7 through a subscription to the site Free repair procedures will soon be available by going to www genuinegmparts com 2014 6 2L V8 Ecolec3 2014 Chevrolet Silverado na re e p rna ae Apr Jun 2013 Servicelnsights The Business of Repairs Electronic Parts Ordering Can Be a GM Rewarding Experience If you re using RepairLink with MORE www moreoemparts com by OEConnection to order Genuine GM Parts you are already one step ahead of the competition By placing orders with your GM dealer online you re saving precious time as well as minimizing the chance of i ee ees E receiving the oe repairlink with PET wrong part 4 tea tias Mal APPLACERERT BPE There s another reason for choosing to use Repair
15. actual reman process to just two manufacturing partners All qualified engine cores are routed to either AER in Carrollton Texas or Springfield Mo based SRC There engines are cleaned tested repaired rehabbed updated and transformed into GM reman engines Apr Jun 2013 Servicelnsights 11 Genuine cn Parts We re one stop For your shop Genuine GM Parts Engines and Transmissions Plus all the Powertrain Components you need CLIP AND PLACE BY YOUR TELEPHONE Genuine jou i Parts Give us a call for all of your Genuine GM Parts needs all at one convenient location
16. al manufacturers Controls and Communication The seminar covers how the modern HVAC system features new sensors actuators control strategies and in vehicle com munication networks It highlights that the operation of the air conditioning com pressor is managed by the Engine Control Module ECM In addition to the Interior Comfort Controls seminar ACDelco offers a variety of Web based training courses and instructor led hands on classes To review the latest training courses available log in to the ACDelco Learning Management the Training tab System by visiting www acdelcotechconnect com and clicking To learn when ACDelco seminars will be scheduled in your Air Conditioning Service Tips Keep these tips in mind about system performance and protection during air conditioning repairs ACDelco recommends replacing O rings and seal washers during joint service Most ACDelco replacement parts come with the necessary seals required When new O rings are installed lubricate both the O ring and the threaded joint with mineral oil to maintain the seal s ability to properly seat as well as prevent corrosion of the joint thread Do not use PAG oil to lubricate the joints since it is hydroscopic and may cause joint threads to corrode Lubrication Use PAG oil only when replacing an air conditioning compressor Do not use ester oil Be sure the PAG oil meets or exceeds OEM specifications for viscosity additives and ty
17. alue When using a scan tool during diagno sis it is possible that the temperature reading on the scan tool will differ from the temperature displayed on the DIC radio without there being a problem with the vehicle The DIC Radio only displays the reading being sent trom the BCM hanks to Ernest Haller ACDelco Announces New Part Enhancements ACDelco has recently introduced sev eral new and enhanced parts covering spark plugs brake pads and starters Double Platinum Spark Plug 41 962 y ad The new double platinum spark plug 19299585 4 1 962 covers many older applica tions currently covered by spark plug 41 110 The new Spark plug is a high quality double platinum spark plug that covers many GM truck applications where double platinum plugs were used In production including 1999 2007 Chevrolet Silverado and GMC Sierra models equipped with 4 8L 5 3L 6 0L engines and 2000 2006 Chevrolet Suburban Tahoe and 2000 2003 GMC Yukon Police Vehicle Brake Pads ACDelco police vehicle brake pads now feature a proprietary new surface coating that improves the pre burnish With Coating WERTE Costing brake effectiveness of the pads for immediate performance improvement that reduces the break in period The coating is applied to the friction surface during manufacturing using a highly controlled process to ensure uniform coverage and applied density The new coating does not alter any previously published o
18. anifold runner flatness which can cause coolant and oil leaks and air leaks It takes about 15 seconds to remove 0 203mm 0 008 In of metal with an abrasive pad e Abrasive pads rubber finger wheels and wire wheels with high speed grinders produce air borne debris that can travel throughout the shop and contaminate other work being performed outside of the immediate work area When using surface conditioning discs that contain abra sives aluminum oxide a common component of sandpaper is dislodged from the disc along with metal particles trom the engine component Even the finger type discs which don t appear to have any type of abrasive material contain aluminum oxide The pres ence of aluminum oxide In engine oil has been shown to cause premature engine bearing failure in some cases In as little as 1 000 miles 2 200 km or less after the repair has been made Surface con ditioning discs also may grind the component material and imbed it into the disc This can result when more aggressive grind ing of the gasket surface takes place a J l F Abrasive discs can remove enough metal to cause leaks Any debris from these surface conditioning discs cannot be properly cleaned from the oil passages with shop air or solvents Recommended Cleaning Procedures GM recommends the use of a plastic razor blade or plastic gasket scraper to clean the gasket surface on engine compo nents that are to be
19. ces or surfaces But that s rare because the process of engineering GM reman engines is so exhaustive It has to be when the goal is to produce a functional carbon copy of an original GM engine and sell it under the GM name This is the key point of difference between GM and aftermarket rebuilds GM remanufactured engines are GM equipped All the rest unfortunately come equipped with that asterisk m Ti 4 7 Surfaces Restored to Original Genuine Parts Production Finish The engine block is re bored and re honed to the point where we restore the original production finish on joint surfaces and inside cylinder walls Lucas says Aftermarket suppliers don t take the care that we do and that sometimes results in compression ratios being thrown off New or repaired parts must meet exacting specifi cations before installation To that end GM reman engineering and design teams work closely with GM OE design teams Parts suppliers are also part of the process The end result is parts guaranteed to conform to an engine s original design and performance standards GM ensures that its suppliers have the capabilities needed to meet our production standards so that the engines we produce perform to OE levels of quality Lucas Says These engines have to perform and we have to make sure they will plug and play into the original vehicle configurations and meet emissions requirements GM entrusts the
20. e e To launch a Simulation SIM SIMs require users to complete all repairs for a condition click Take Training gt Simulations to view the catalog and select a diagnostic challenge simulation Thanks to Greg St Aubin Course Name Engine Performance Computer Controls and Ignition System Diagnostics Engine Performance Air Induction and Fuel System Diagnostics Engine Performance Fault Monitoring and Emission System Diagnostics After Combustion Sensors Is what is in the exhaust making your engine run rough Evaporative Emissions Controls Why is there always a code but never a leak we can find Spark Generation Is a lack of spark sending you up in flames Duramax Diesel Operation and Diagnosis Vibration Correction Diagnostics Course Name S ELO6 02 01VCT Testing Electrical Signal and Control Circuits S EL06 03 01VCT Serial Data Communication Networks S ELO6 04 01VCT Communication Network Diagnosis 8 TECHCONNECT Genuine E Parts 2014 Sierra and Silverado The Technical Side cont d continued from page 6 EcoTec3 Engines Aluminum blocks and heads help lower weight The new engine family includes VY Anew standard 4 3L V6 Its large displacement delivers the torque to power a crew cab and pull a substantial trailer Y Anew 5 3L V8 It is engineered to provide more horsepower more torque and better fuel economy than the current 5 3L V8 Y Anew 6 2L V8 It is engineered to be the most cap
21. e EBCM leading to a traction control issue e No High Speed LAN communica tion along with various DTC com munication U codes e Transmission will not shift for one key cycle TCM in default mode e Instrument cluster gauges erratic or flickering e Check Engine MIL illuminated and numerous DTC communica tion codes such as U0100 Lost Communication With Engine Control Module e Diesel power up devices resulting in no power in 4WD Low range e Service Tire Pressure Monitor system MIL illuminated cannot relearn the Tire Pressure Monitor system e Hybrid issues regarding reduced propulsion power DIC messages and service high voltage charging system DIC messages GM Service Information provides a Diagnostic System Check Vehicle as a Starting point for any diagnostic proce dure It calls out that there should not be any aftermarket devices connected or installed that affect the operation of the system The Diagnostic System Check Instructions also provide further information about aftermarket acces sories and their possible negative effect on the vehicle During diagnosis if nothing else can be identified as the root cause of the condition check for a device plugged into the DLC If a device is available attempt to duplicate the condition Remove the device to determine if the condition is eliminated If confirmed inform the customer of the issue and that it will be necessary to work with the supplier of the
22. e code to download a PDF When a logic 0 is to be transmit ted the GMLAN High signal circuit is driven higher to about 3 5V and the GMLAN Low circuit is driven lower to about 1 5V The differential voltage becomes approximately 2 0 V The GMLAWN Chassis Expansion Bus is a copy of the High Soeed GMLAN Bus In this case the expansion bus is reserved for chassis components Other components are grouped togeth er in other expansion busses such as the GMLAN Object Bus that is used for the enhanced safety system This implementation splits message con gestion between two parallel buses Communication between the Chassis Expansion Bus and the primary High Speed GMLAN Bus is accomplished by using the Electronic Brake Control Module EBCM as the Gateway module The MOST Infotainment network is a dedicated high speed multimedia streaming data bus independent from GMLAN The MOST bus is configured in a physical hardwired loop with each device within the bus sending and receiving data on an assigned MOST address in a set order The radio is the MOST Master and monitors the bus for vehicle configuration infotainment data messages and errors on the bus This bus is an example of a sub system that is used to transfer high rate display graphics between the radio and the Info Display Module and or the radio and the HVAC control Communication between the CAN Graphical Interface Bus and the Low Speed GMLAN Bus is accomplished by
23. iles warranty manual transmissions are covered for 12 months or 12 000 miles These terms also apply to many Chevrolet Performance Parts products The Performance Parts Engine warranty is 24 months or 50 000 miles E RODs are 36 months or 50 000 miles non E ROD Connect amp Cruise Crate Powertrain Systems have a 24 months or 50 000 miles protection and Transmissions Short Block Assemblies amp Components have 12 months unlimited miles coverage Chevrolet Performance E ROD and non E ROD Connect amp Cruise Crate Powertrain Systems are covered when all required components on a vehicle are purchased on one invoice E Rod and E Rod Connect amp Cruise packages allow the purchaser to leverage Chevrolet Performance engineering durability and quality into their street rods at an affordable price while ensuring emissions compliance and ease of installation says Grant Powers product specialist Engines for GM Customer Care 3 0L V6 Fully Dressed Engine Apr Jun 2013 Servicelnsights E The Business of Repairs cont d amp Aftersales GM CCA The enhanced warranty for these packages is a testament to our commitment to these products Additionally the warranty terms expand coverage for GM Parts Engine amp Transmission Components to 12 months unlimited miles Towing Included Another notable feature of the enhanced warranty is clarification that towing is included Coverage applies when a vehicle eq
24. ions For example some systems have the ECM deactivate the compressor clutch relay when the engine throttle nears wide open position to reduce the mechanical load the compressor places on the engine Using real world scenarios based on vehicles from several manu facturers the seminar covers all aspects of the Heating Ventilation and Air Conditioning HVAC system It reviews the inputs and out puts that enable HVAC operation and those that can affect HVAC performance It In car temperature sensor Case Studies have occurred when the demand for engine power is at its greatest Other aspects of system operation also are reviewed such as the latest networked configurations that use a dedicated HVAC control module to manage communication with the HVAC controls as well as other vehicle systems A number of case studies provide insight into how to best approach HVAC diagnosis and repairs For example one case points out how to diagnose a poor A C performance condition where the engine cooling fans are inoperative and another covers a condition with the automatic climate controls default ing to a full cold or full hot position Additional information reviews heater core leaks and elec trolysis Electrolysis should be checked any time repeat repairs Training Opportunities also highlights a number of service tools and techniques such as actuator installation and diagnostic procedures for systems from sever
25. made to ensure the accuracy of the information in the offers contained in this magazine However printing and typographical errors may occur These are not intentional and are not the responsibility of GM any dealer or the companies or individuals who ae create produce and distribute this magazine Offers We Support Voluntary Certification and pricing may change at any time without prior National Institute for notification The descriptions and specifications in this AUTOMOTIVE SERVICE EXCELLENCE publication were in effect at the time of approval for printing General Motors reserves the right to change WWW ase com specifications without notice and without obligation Published letters do not necessarily reflect the opinions of General Motors or General Motors Parts General Motors Detroit MI 48202 2013 General Motors All rights reserved 2 Apr Jun 2013 Servicelnsights Genuine il Parts GM OE Service Parts Update After a Brief Hiatus GM is Again Offering Remanufactured 5 3L V8 Engines for 2007 2009 Trucks and Sport Utility Vehicles Owners of 2007 2009 Chevrolet Silverado Tahoe and Suburban and GMC Sierra Yukon and Denali now have a choice of either a new or remanufactured GM replacement engine when determining their repower needs The durability and longevity of our 5 3L engine was so good that the cores needed to support a reman program was scarce says Grant Powers product specialist Engine GM C
26. mart devices that provide Supporting functionality The scan tool communicates over the various buses on the vehicle When connected to a vehicle the scan tool will try to communicate with every device that could be optioned into the vehicle If an option is not installed on the vehicle the scan tool will display No Comm or Not Connected for that optional device For information about diagnosing serial data communication network issues ACDelco offers a number of training courses To learn more go to www acdelcotechconnect com and click the Training tab Thanks to Rick Balabon 2 TECHCONNECT ACVelco Volume 20 Number 2 TS PU 0002 13 ACDelco TechConnect is published bi monthly and online for Independent Service Centers and Key Fleet accounts to provide timely service information increase knowledge and improve the performance of the service center ACDelco 360 represents our mission to look at our businesses at every possible angle to provide value and assistance to our distributors and their customers as well as offer a full circle of support with programs tools training and marketing focused on enhancing and growing our partnership successfully Publisher Rick Balabon ACDelco E mail lt richard balabon gm com Editor Greg St Aubin ACDelco E mail lt gregory staubin gm com Technical Editor Mark Spencer E mail lt mspencer gpworldwide com Production Manager Marie Meredith Desk
27. n car burnish recommenda tions However it significantly increases the effectiveness during initial braking as well as throughout the life of the brake pad After installing these brake pads the coating may exhibit a slight amount of visible airborne gasses as it transfers material onto the brake rotor surfaces This will occur for a very brief time period during the burnish proce dure and will then subside 6 TECHCONNECT New Professional Starter for Duramax Diesels A new ACDelco Professional starter part number 337 1123 is available for many 2001 2010 full size GM trucks and vans equipped with the Duramax Diesel 6 6L V 8 The starter features 100 all new components with no core charge The new starter is offered in addition to ACDelco Professional starter 336 1737A Delco Supreme Brake Fluid Discontinued ACDelco has discontinued Delco Supreme 11 brake fluid part number 10 4043 ACDelco DOT 3 GMW brake and clutch fluid part number 10 4090 is recommended to be used in its place This new product is a hydraulic brake fluid designed for use where a DOT_ 3 motor vehicle brake fluid is recom mended by the manufacturer Thanks to Rick Balabon TechTips The following technical tips provide repair information about specific conditions on a variety of vehicles If you have a tough or unusual service repair the Diagnostic Hotline can help Call 1 800 825 5886 prompt 2 from 8 a m to 8 p m ET Monday Friday to
28. nostics S DS11 13 01ILT Vehicle Network Communications Look S EP08 03 01ILT 9 EP08 04 01ILT who s talking When modules talk who is really listening S EP08 06 01ILT S ELO6 04 02ILT Network Communication Diagnosis S ELO6 10 02ILT Electrical Power Management S EP08 08 02ILT S ELO6 11 02ILT Enhanced Automotive Circuit Diagnosis S ELO6 12 01ILT Hybrid Technology and Service S EP08 09 01ILT S ELO6 13 01ILT Body Electrical Global Diagnostics S ELO6 14 01ILT Advanced Body Control System Electrical Diagnostics S EP08 31 02ILT S SS04 01 01ILT Current Virtual Classroom Training Courses The following VCT courses are currently being scheduled Course Number Course Name S AC07 02 01VCT HVAC System Operation and Service Hints S AC07 04 01VCT HVAC System Engine Cooling Controls and Communication TS PU 0002 13 Course Number e To enroll in a Virtual Classroom Training VCT course VCTs are 1 2 hour live online courses click Take Training gt Virtual Classroom Training to view the catalog and select a specific course e To launch a Web Based Training WBT course WBTs are 1 4 hour self guided online courses click Take Training gt Web Based Training to view the catalog and select a specific course e To launch a TechAssist TAS course TAS courses are 15 20 minute online presentations on a specific topic click Take Training gt TechAssist to view the catalog and select a specific cours
29. om other sources as well as transmit infor mation to other sources Serial data communication networks provide a way for various components of the vehicle to talk to one another and share information GM uses a number of different communication buses to ensure the exchange of information between devices Some of these buses are dif ferent in nature as far as speed signal characteristics and behavior such as the High Speed GMLAN GM Local Area Network and Low Speed GMLAN buses Other buses that have similar characteristics simply operate in parallel They are used to group together com ponents that interact frequently such as the Powertrain Expansion and Chassis Expansion buses This allows them to communicate with each other on a bus with reduced message congestion for a faster and timelier exchange of informa tion than if all vehicle devices were on a single bus The majority of information that exists within a given network generally stays local however some information must be shared on other networks Control modules designated as Gateways perform the function of transferring information between the various buses A Gateway module is connected to at least two buses and Interacts with each network according to its message strat egy and transmission models Here s an overview of a typical GM serial data communication network on a vehicle High Speed GMLAN A High Speed GMLAN Bus is used where data needs
30. pe The amount of PAG oil used in the air conditioning system Is critical to proper operation Follow the proper oll balancing procedure before compres sor installation to avoid premature compressor replacement failure since PAG oil is hydroscopic do not expose it to the atmosphere for prolonged periods which will contami nate the oil with moisture Systems that have been contaminated by seal ants may require replacement of the receiver dryer accumulator as well as refrigerant flushing Leak Detection Major or repeat compressor failure is often due to an insufficient amount of refrigerant Failure to correct leaks at the source will quickly fail replace ment compressors ACDelco retrig erant dye is approved by all OEM compressor manufacturers Use the 5 TECHCONNECT area contact your local ACDelco distributor Thanks to Rick Balabon dye to help determine the leak loca tion for both active and passive leaks Filters and Screens When a compressor fails contami nation is distributed throughout the refrigerant system The type of failure determines the extent of cleanup Flushing is only recommended after severe failure modes OEM screens filters should be inspected and replaced and auxiliary filters also should be installed to pro vide additional screen capacity for the TXV orifice Suction line screens are recom mended when installing a service compressor for added protection This low cost highl
31. plications is 19300401 the number for 2010 2011 and installation easier app neetiehs eave a eden patna The kits apply to 2007 2011 vehicles with the 5 3L engine Cadillac Escalades Chevrolet Avalanche Silverado 1500 Suburban and Tahoe and GMC Sierra 1500 Denali and Yukons Pontiac G8 GTs in the 2008 2009 model years are also covered as are other select vehicles with iron and aluminum block V 8s with Active Fuel Management The new kits are not listed in the Genuine GM Parts catalog and are only available through Genuine GM Parts dealers Years Part Number Applications 2007 2009 19300401 Avalanche Denali Escalade G8 GT s Sierra Silverado Suburban Tahoe Yukon 2010 2011 19300411 Avalanche Denali Escalade Sierra Silverado Suburban Tahoe Yukon 4 Apr Jun 2013 Servicelnsights Genuine faim The Technical Side 2014 Truck Leaders Stronger and More Capable Silverado Bold and Refined Sierra Ready to Launch Next generation pickups feature advanced powertrains design and technology 2014 Silverado and Sierra at a Glance Silverado and Sierra cabs are stronger than ever before with nearly two thirds of the structure made from high strength steel for a confident feel and improved safety ee a h Ff Similarly the main rails and key cross members of the updated frame are high strength steel with major elements hydroformed for reduced mass and improved strength a F PE
32. s or components that enter the program survive the cut All engine cores are tested for interior damage with Magnaflux liquid penetrants such as Zyglo Cracked or badly degraded blocks cylinder heads crankshafts and other key components routinely enter the recycling stream to the tune of six million pounds annually The fallout rate is up to 50 percent on some components says Tracy Lucas manager Engine Service and Remanufacturing GM Customer Care amp Aftersales Genuine Parts If we determine in our initial inspection and validation Before a commercial reman program is launched testing that there s been major damage we won t prospective reman designs are subjected to rigorous third reuse them We supplement where we have to with party testing Designs that may fail in testing are carefully new materials studied by GM engineering teams to uncover flaws and New parts in the engine needing replacement engineer corrections are commonly manufactured by GM and manufacturing partners supply others Other parts such as gaskets valve seats fasteners oil pumps and pickup tubes bearings pistons ring kits and timing system components are replaced regardless of condition Parts that can be repaired or rehabilitated are carefully re machined before integration into the reman id le engine GM is a stickler for precision Ei 4 3L V6 Reman Engine therefore no welding or hand grinding is used to restore toleran
33. speak with a technical expert with the latest OEM information New Full size Truck Front Axle Shaft Seal Installation 1998 2013 Chevrolet and GMC 1500 series four wheel drive and all wheel drive trucks A new front axle shaft seal has been released for service repairs that has several changes to be aware of during installation The new front axle shaft seal part number 22761722 has a different appearance than the old seal The previous seal has exposed metal facing inward toward the fluid Outward facing side of the new seal with the words AIR SIDE When installing the new seal the exposed metal should face outward and the black side of the seal should face inward The words Air Side also are molded into the rubber on the outward facing side Use TXL Wire in Wiring Repairs When making wiring repairs in the engine compartment TXL wire should be used TXL wire is designed to pro vide reliable high temperature perfor mance in a small diameter with minimal weight All important aspects in an engine harness It meets SAE standard J1128 for low voltage primary cable in vehicle electrical systems Standard primary wire found in most parts stores cannot withstand the tem peratures and physical abuse common in the automotive environment TXL wire features a multi stranded copper core and lightweight cross linked poly ethylene insulation It has a tempera ture rating of 40 F 40 C to 257 F 125 C at 60
34. to be exchanged at a high enough rate to minimize the delay between the occurrence of a change in sensor value and the reception of this information by a control device using the information to adjust vehicle sys tem performance The High Speed GMLAN serial data network consists of two twisted wires One signal circuit is identified as GMLAN High and the other signal circuit is identified as GMLAN Low Data symbols 1 s and 0 s are transmit ted sequentially at a rate of 500 Kbit s The data transmitted over the bus is represented by the voltage differ ence between the GMLAN High signal voltage and the GMLAN Low signal voltage When the two wire bus is at rest the GMLAN High and GMLAN Low signal circults are not being driven and this represents a logic 1 In this state both signal circuits are at the same voltage of 2 5V The differential voltage is approximately OV continued on page 2 ME GIN yy Tere IN THIS ISSUE Vehicle Serial Data Communication Networks Aftermarket Devices Plugged into the Data Link Connector Cleaning Engine Gasket Sealing Surfaces 4 New Interior Comfort Controls Seminar 5 Air Conditioning Service Tips Outside Air Temperature Display Operation ACDelco Announces New Part Enhancements Tech Tips m Training Update www acdelcotechconnect com click the Newsletters link Follow ACDelco Scan th
35. top Publishing 5by5 Design LLC E mail lt dkelly 5by5dzign com Write to ACDelco TechConnect P O Box 500 Troy MI 48007 0500 On the Web amp To read or print recent issues of TechConnect www acdelcotechconnect com click the Newsletters link ACDelco service tips are intended for use by professional technicians not a do it yourselfer They are written to inform those technicians of conditions that may occur on some vehicles or to provide information that could assist in the proper service of a vehicle Properly trained techni cians have the equipment tools safety instructions and know how to do a job properly and safely If a condition is described it cannot be assumed that the information applies to all vehicles or that all vehicles will have that condition All materials and programs described in this magazine are subject to change Submission of materials implies the right to edit and publish Inclusion in the publication is not necessarily an endorsement of the individual or the company TechConnect is published for ACDelco by Sandy Corporation Troy MI 2013 ACDelco All rights reserved Multiple Conditions Caused by Aftermarket Devices Plugged into the Data Link Connector For everything from saving on auto mobile insurance to connecting after market cruise control there are now a number of devices that owners plug into the Data Link Connector DLC or Assembly Line
36. uipped with a GM OE engine transmission or transfer case assembly must be towed due to a failure as a result of materials or workmanship of the installed unit Towing coverage is to the nearest GM dealership or the ISC who performed the installation up to a maximum of 150 Connect e Cruise 6LS0E 10 Apr Jun 2013 Servicelnsights The GM OE Remanufactured Engine Always the Real Deal Watch Out for the Fine Print with Aftermarket Rebuilds The dreaded asterisk An means yes but read the fine print exceptions apply A replacement engine for a General Motors vehicle purchased from anyone but your GM dealer might as well carry that asterisk because they re not the real thing Why Because they don t come out of a manufacturing culture renown for quality attention to detail rigorous processes and unbending standards All of which are cornerstones in producing the GM remanufactured engine No a GM OE remanufactured engine shouldn t be confused with a new GM engine But a GM reman is as good as new and that carries a lot of meaning when GM quality is the benchmark Yes rebuilders and aftermarket suppliers might be able to revive an old GM engine But only the GM reman process should be trusted to produce a level of quality and reliability that justifies the cost and the choice to go the reman route Not All Cores Created Equal Take GM s vetting process Not all engine core
37. ustomer Care and Aftersales GM CCA We ve been able to bank enough engine cores supplemented with new engine availability that we are able to re launch the program he continued Owners of trucks with these 5 3L engines are big replacement candidates because they see their trucks as outfitted like a tool that s harder to replace than the engine Your GM dealer is the primary market source of remanufactured and new 5 3L engines Regardless of whether customers select the value priced reman or the all new replacement GM stands behind them Both carry 36 months or 100 000 miles warranty protection 5 3L V8 New part number 19301690 Reman part number 19209698 2007 Chevrolet Silverado Apr Jun 2013 Servicelnsights EI GM OE Service Parts Update cont d Piston Ring Kits Now Available for Select GM 5 3L Engines One part number one box and a value price It s now that easy to get the Genuine GM Parts solution to repairing piston ring assemblies on 2007 2011 GM 5 3L engines Instead of having to order parts individually from piston assemblies which consist of a piston pin and Genuine GM Parts dealers ISCs can now order a single kit retainers and eight piston ring kits which consist of a rail that contains the major parts needed to restore piston ring spacer and rings integrity in these popular engines The single part number for kits applying to 2007 The kit based solution makes ordering 2009 ap
38. y effective protection can be implemented with any com pressor where the manufacturer does not provide a factory screen Thanks to Rick Balabon The outside air temperature is displayed on the Driver Information Center radio or rear view mirror in a number of GM vehicles There may be some confusion about the operation of the display and how quickly It uodates ambient temperature Depending on several factors the temperature may not be updated immediately and owners may feel that the display is inaccurate at times As an example here s a look at the operation of the outside air temperature display on several GM small cars from recent model years The ambient air temperature sensor is a variable resistor interfaced to the Body Control Module BCM The ambient air temperature sensor is a 2 wire negative temperature coefficient thermistor The BCM applies 5 volts to an internal input resistor connected to the signal circuit of the ambient air tempera ture sensor The BCM also provides the ground to the ambient air temperature sensor through the low reference circult When the ambient air temperature is cold the sensor resistance is high and the signal voltage is high When the ambient air temperature is hot the sensor resistance is low and the voltage signal is low The BCM provides the logic for reading the ambient air temperature sensor filtering the data and transmitting the information via the serial data
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